Angle-resolved optically detected magnetic resonance as a tool for strain determination in nanostructures

In this paper, we apply the angle-resolved optically detected magnetic resonance (ODMR) technique to study a series of strained (Cd, Mn)Te/(Cd, Mg)Te quantum wells (QWs) produced by molecular beam epitaxy. By analyzing characteristic features of ODMR angular scans, we determine the strain-induced axial-symmetry spin Hamiltonian parameter D with neV precision. Furthermore, we use low-temperature optical reflectivity measurements and x-ray diffraction scans to evaluate the local strain present in the QW material. In our analysis, we take into account different thermal expansion coefficients of the GaAs substrate and CdTe buffer. The additional deformation due to the thermal expansion effects has the same magnitude as the deformation that originates from the different compositions of the samples. Based on the evaluated deformations and values of the strain-induced axial-symmetry spin Hamiltonian parameter D, we find the strain spin-lattice coefficient G(11) = (72.2 +/- 1.9) neV for Mn2+ in CdTe and shear deformation potential b = (-0.94 +/- 0.11) eV for CdTe.

Automated summary

In this paper, the angle-resolved optically detected magnetic resonance (ODMR) technique is used to study strained (Cd, Mn)Te/(Cd, Mg)Te quantum wells. The strain-induced axial-symmetry spin Hamiltonian parameter D is determined through analysis of ODMR angular scans, and the local strain present in the QW material is evaluated using low-temperature optical reflectivity measurements and x-ray diffraction scans.